% TeX root = ../main.tex
{ 
\RestyleAlgo{plain}
\SetAlgoNoLine
\LinesNotNumbered 
\begin{algorithm}[H]
    $x = u$\,\;
    \lIf{$1 \leq x \leq 3$}{$x = x + 1$}
    \lWhile{$2 \leq x \leq 3$}{$x = x + 1$}
    \lWhile{$y \geq 0$}{$y = y + 1$}
\end{algorithm}
}